KVM_MAX_VCPU hard limit of 255 on x86

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Hello,

For research, I am experimenting with increasing the number of VCPUs
in the guest OS.
I can increase the number of VCPUs till 255 in the guest OS but more
than that results in the following error-

kvm_init_vcpu failed: Invalid argument

The hardcodede value of 255 can be found here for x86.
./arch/x86/include/asm/kvm_host.h:38:#define KVM_MAX_VCPUS 255

#define a new value is not successful i.e. the same error persists.
I'm using qemu 2.5.0 with host kernel 3.19.0
Any help will be really appreciated.

Thank you,
Hardik Bagdi
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